From: Jakub Kicinski <kuba@kernel•org>
To: Eli Cohen <elic@nvidia•com>
Cc: virtualization <virtualization@lists•linux-foundation.org>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>
Subject: Re: utilizing multi queues of a net device
Date: Mon, 2 May 2022 09:21:34 -0700 [thread overview]
Message-ID: <20220502092134.160f43b3@kernel.org> (raw)
In-Reply-To: <DM8PR12MB5400B7E41EB88FF4C9E0F87AABC19@DM8PR12MB5400.namprd12.prod.outlook.com>
On Mon, 2 May 2022 04:29:09 +0000 Eli Cohen wrote:
> Hi all,
>
> I am experimenting with virtio net device running on a host. The net device has
> multiple queues and I am trying to measure the throughput while utilizing all
> the queues simultaneously. I am running iperf3 like this:
>
> taskset 0x1 iperf3 -c 7.7.7.24 -p 20000 & \
> taskset 0x2 iperf3 -c 7.7.7.24 -p 20001 & \
> ...
> taskset 0x80 iperf3 -c 7.7.7.24 -p 20007
>
> Server instances with matching ports exist.
>
> I was expecting traffic to be distributed over the available send queues but
> the vast majority goes to a single queue. I do see a few packets going to other
> queues.
>
> Here's what tc qdisc shows:
>
> tc qdisc show dev eth1
> qdisc mq 0: root
> qdisc fq_codel 0: parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
> qdisc fq_codel 0: parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
>
> Any idea?
Make sure XPS is configured correctly. Looks like virtio_net cooked
a less-than-prevalent-for-networking way of distributing CPUs.
next prev parent reply other threads:[~2022-05-02 16:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-02 4:29 utilizing multi queues of a net device Eli Cohen
2022-05-02 16:21 ` Jakub Kicinski [this message]
2022-05-03 10:11 ` Eli Cohen
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